The subdwarf B star SB 290-A fast rotator on the extreme horizontal branch
Geier S, Heber U, Heuser C, Classen L, O'Toole SJ, Edelmann H (2013)
Publication Type: Journal article
Publication year: 2013
Journal
Book Volume: 551
Article Number: L4
DOI: 10.1051/0004-6361/201220964
Abstract
Hot subdwarf B stars (sdBs) are evolved core helium-burning stars with very thin hydrogen envelopes. To form an sdB, the progenitor has to lose almost all of its hydrogen envelope right at the tip of the red giant branch. In close binary systems, mass transfer to the companion provides the extraordinary mass loss required for their formation. However, apparently single sdBs exist as well, and their formation has been unclear for decades. The merger of helium white dwarfs leading to an ignition of core helium-burning or the merger of a helium core and a low-mass star during the common envelope phase have been proposed. Here we report the discovery of SB 290 as the first apparently single, fast-rotating sdB star located on the extreme horizontal branch, indicating that those stars may form from mergers. © 2013 ESO.
Authors with CRIS profile
Stephan Geier
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Ulrich Heber
Naturwissenschaftliche Fakultät
Christian Heuser
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Lew Classen
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Heinz Edelmann
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Involved external institutions
Australia (AU)How to cite
APA:
Geier, S., Heber, U., Heuser, C., Classen, L., O'Toole, S.J., & Edelmann, H. (2013). The subdwarf B star SB 290-A fast rotator on the extreme horizontal branch. Astronomy & Astrophysics, 551. https://doi.org/10.1051/0004-6361/201220964
MLA:
Geier, Stephan, et al. "The subdwarf B star SB 290-A fast rotator on the extreme horizontal branch." Astronomy & Astrophysics 551 (2013).
BibTeX: Download